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Circadian Variation of Heart Rate Variability Among Welders



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  • Personal Author:
  • Description:
    Objective: To compare the circadian variation of hourly heart rate variability (HRV) on work and non-workdays among boilermaker construction workers. Method: A panel study of 18 males monitored by 24-h ambulatory ECG over 44 observation-days on paired work and non-workdays was conducted. ECGs were analysed and the SD of normal-to-normal beats index (SDNNi) was calculated from 5-min data and summarised hourly. SDNNis over work and non-workdays were compared using linear mixed-effects models to account for repeated measures and harmonic regression to account for circadian variation. Results: Both work and non-work hourly HRV exhibited circadian variation with an increase in the evening and a decrease in the afternoon. SDNNi was lower on workdays as compared with non-workdays with the largest, statistically significant differences observed between 10:00 and 16:00, during active working. Lower SDNNi, albeit smaller yet statistically significant differences, was also observed in the evening hours following work (17:00-21:00) and early morning (4:00). In regression models using all time periods, an average workday SDNNi was 8.1 ms (95% CI -9.8 to -6.3) lower than non-workday SDNNi. The circadian pattern of HRV exhibited two peaks which differed on work and non-workdays. Conclusion: While workday and non-workday HRV followed a circadian pattern, decreased HRV and variation of the circadian pattern were observed on workdays. Declines and changes in the circadian pattern of HRV is a concern among this exposed population. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    1351-0711
  • Document Type:
    Text
  • Funding:
    Grant
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    67
  • Issue:
    10
  • NIOSHTIC Number:
    nn:20054071
  • Citation:
    Occup Environ Med 2010 Oct; 67(10):717-719
  • Contact Point Address:
    Jennifer M. Cavallari, Harvard School of Public Health, Department of Environmental Health, Environmental and Occupational Medicine and Epidemiology Program, 665 Huntington Ave, FXB-103, Boston, MA 02115, USA
  • Email:
    jcavalla@hsph.harvard.edu
  • Federal Fiscal Year:
    2011
  • Performing Organization:
    Harvard School of Public Health
  • Peer Reviewed:
    True
  • Start Date:
    20050701
  • Source Full Name:
    Occupational and Environmental Medicine
  • End Date:
    20280630
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:3385aecc97353d8e3754e2f8963e7d56c28202431a1d07dde6b48c04038de9442485feaa6e9946c1597c5903a8402fff263c92e5d829fe10461093f7de680758
  • Download URL:
  • File Type:
    Filetype[PDF - 66.57 KB ]
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